ENERGY RECOVERY INC (ERII) Institutional Ownership Changes & 13F Activity

ENERGY RECOVERY INC (ERII) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Renaissance Technologies LLC.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Renaissance Technologies LLCBuy41,280144,265$1,452,749
Q4 2025Renaissance Technologies LLCBuy47,385102,985$1,389,268
Q3 2025Renaissance Technologies LLCSell-85,50055,600$857,352
Q2 2025Renaissance Technologies LLCSell-100,400141,100$1,803,258
Q1 2025Renaissance Technologies LLCBuy51,100241,500$3,837,435
Q4 2024Renaissance Technologies LLCBuy28,400190,400$2,798,880
Q1 2024Renaissance Technologies LLCBuy62,700162,000$2,558
Q4 2023Renaissance Technologies LLCBuy49,80099,300$1,871
Q3 2022Renaissance Technologies LLCSell-40,20049,500$1,076
Q2 2022Renaissance Technologies LLCSell-49,30089,700$1,742
Q1 2022Renaissance Technologies LLCBuy113,900139,000$2,799
Q3 2021Renaissance Technologies LLCBuy9,70025,100$478
Q1 2021Renaissance Technologies LLCSell-18,30015,400$282
Q2 2020Renaissance Technologies LLCSell-34,40033,700$256
Q1 2020Renaissance Technologies LLCSell-8,20068,100$507
Q4 2019Renaissance Technologies LLCSell-22,90076,300$747
Q3 2019Renaissance Technologies LLCBuy58,40099,200$919
Q1 2019Renaissance Technologies LLCSell-237,90040,800$356
Q3 2017Renaissance Technologies LLCSell-128,600278,700$2,202
Q2 2017Renaissance Technologies LLCSell-34,600407,300$3,377
Q1 2017Renaissance Technologies LLCBuy425,500441,900$3,677
Q4 2016Renaissance Technologies LLCSell-7,50016,400$170
Q3 2016Renaissance Technologies LLCSell-244,20023,900$382
Q2 2016Renaissance Technologies LLCBuy126,300268,100$2,383
Q1 2016Renaissance Technologies LLCSell-13,900141,800$1,466
Q4 2015Renaissance Technologies LLCBuy14,600155,700$1,101
Q2 2013Renaissance Technologies LLCBuy141,100141,100$583

Frequently asked questions about ERII activity

  • Which institutional owners are buying ERII?

    Institutional owners buying ERII include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in ERII activity?

    "Buy" means an investor increased their reported position in ERII compared to the prior reporting period. This reflects growing exposure to ENERGY RECOVERY INC (ERII) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in ERII increasing?

    Institutional interest in ERII can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

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